Preparation and electrochromic properties of tungsten oxide and iridium oxide porous films

In this article, sol–gel preparation of porous tungsten oxide and iridium oxide films by using polystyrene template was described. Cyclic voltammograms showed that the electrochromic properties of the porous films were 1–2 orders better than those of relative non-porous films. The porous films are expected to be used to buildup a new ECD with better electrochromic properties than normal ECD composed by corresponding non-porous films.